Abstract: Mobile mental health applications (apps) have been shown to be helpful tools among trauma-exposed groups. Previous studies have emphasized the feasibility, user satisfaction, and engagement with apps, such as posttraumatic stress disorder (PTSD) Coach, in more controlled research settings (Br & ouml;cker et al., 2023). However, little is known about users and their experiences with PTSD Coach in more naturalistic settings. This quality improvement project surveyed 164 users of the PTSD Coach app (Version 3.5.3), developed by the U.S. Department of Veterans Affairs (VA) National Center for PTSD (NCPTSD). Four domains were assessed: (a) mental health-related user characteristics, (b) initial review of app features and functions, (c) how users learned about the app, and (d) their main reason for using the app, as well as app functions they were most interested in. Descriptive and chi-square statistics were employed to assess differences in these four domains as a function of user PTSD diagnostic and veteran status. Overall, survey respondents reported high rates of personal PTSD diagnoses (80.0%) and among family members and friends (57.9%). Key findings indicated that users found the app helpful (90.2%), easy to use (69.5%), and would recommend the app to others (90.9%). No differences were found in any app-related responses based on a PTSD diagnostic status. However, U.S. veterans were twice as likely to learn about PTSD Coach through a health care provider (64.2%) compared with civilians (31.6%). These findings support NCPTSD's model for app development and improvement (Owen et al., 2025), suggesting that app marketing and education programs within and outside of the VA are critical for engaging veterans.